Hotel guest cards, 03.01.1985
Letter, A.P. Ershov->Unknown addressee, 06.01.1985The author is sorry that he departed from an associate position and acted like extraneous observer in the examenation of Zelenograd computer classes (handwritten)
Notewith telephone number
Note, Yu. A. Pervin ->A.P. Ershov, 04.01.1985(?)asking for a meeting
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